<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- HTML结构 -->
<ul class="lang">
    <li class="js dy">JavaScript</li>
    <li class="dy">Python</li>
    <li id="swift">Swift</li>
    <li class="dy">Scheme</li>
    <li name="haskell">Haskell</li>
</ul>

<form id="test-form" action="#0" onsubmit="return false;">
    <p><label>Name: <input name="name"></label></p>
    <p><label>Email: <input name="email"></label></p>
    <p><label>Password: <input name="password" type="password"></label></p>
    <p>Gender: <label><input name="gender" type="radio" value="m" checked> Male</label> <label><input name="gender" type="radio" value="f"> Female</label></p>
    <p><label>City: <select name="city">
    	<option value="BJ" selected>Beijing</option>
    	<option value="SH">Shanghai</option>
    	<option value="CD">Chengdu</option>
    	<option value="XM">Xiamen</option>
    </select></label></p>
    <p><button type="submit">Submit</button></p>
</form>
<!-- HTML结构 -->
<ul id="test-ul">
    <li class="js">JavaScript</li>
    <li name="book">Java &amp; JavaScript</li>
</ul>

<!-- HTML结构 -->
<ul id="test-css">
    <li class="lang dy"><span>JavaScript</span></li>
    <li class="lang"><span>Java</span></li>
    <li class="lang dy"><span>Python</span></li>
    <li class="lang"><span>Swift</span></li>
    <li class="lang dy"><span>Scheme</span></li>
</ul>
    <script src="./js/jquery-3.5.1.min.js"></script>
    <script src="./jQuery(2).js"></script>
</body>
</html>